Graphene with shielding effect can improve the corrosion resistance of organic coatings, but its high electrical conductivity intensifies the corrosion of metal substrate due to micro-galvanic effect on the interface of coating and substrate. The regulation of graphene’s conductivity can inhibit the corrosion-promotion effect. Hence, graphene supported attapulgite (GNS-ATP) nanosheets with lower conductivity were successfully prepared by using TEOS as coupling agent, then were introduced into Sol-gel coatings via using gamma methacryloxypropyltrimethoxysilane (MPS) and tetraethyl orthosilicate (TEOS) as precursors. The characterization on corrosion resistance of the hybrid coatings illustrates that a small amount of well-dispersed GNS-ATP nanosheets can significantly enhance the corrosion resistance, mainly depending on the structure and performance characteristics of GNS-ATP nanosheets. Such advantages on reducing porosity and conductivity of hybrid coatings offer a better corrosion resistance.

具有屏蔽作用的石墨烯可以提高有机涂层的耐腐蚀性，但是由于涂层和基质界面上的微电流效应，石墨烯的高电导率会加剧金属基质的腐蚀。调节石墨烯的电导率可以抑制腐蚀促进作用。因此，以TEOS为偶联剂成功地制备了电导率较低的石墨烯负载凹凸棒石（GNS-ATP）纳米片，然后以γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）和原硅酸四乙酯（TEOS）为前体将其引入溶胶-凝胶涂料中。杂化涂层的耐腐蚀性表征表明，少量分散良好的GNS-ATP纳米片可以显着提高耐腐蚀性，主要取决于GNS-ATP纳米片的结构和性能特征。降低混合涂层的孔隙率和电导率的这些优点提供了更好的耐腐蚀性。